Martin wrote:
On Sun, 07 Dec 2008 16:10:52 +0000, Stephen wrote:

Hello,

A lot of moss has appeared on our drive (tarmac). What's the best
thing to get rid of it?

water it with ferrous/ferric somat crystals dissolved in water or buy a moss
killer in a garden centre.

http://www.uaf.edu/ces/publications/.../HGA-00133.pdf
Ferrous sulphate, sold as Sulphate of Iron

Malcolm